Abstract: The invention relates to a sound absorber, especially for motor vehicles, comprising a molded part (1) made of thermoplastic material and at least one second part (2) which with the molded part (1) defines a hollow space (7). In order to achieve that such a sound absorber has good media resistance and a high heat resistance with the same or improved acoustic efficiency, it is proposed that a plurality of pin-shaped or spike-shaped spacers (4), which project into the hollow space (7) and are directed towards the second part (2) are formed on the molded part (1), wherein the molded part (1) is provided with a plurality of recesses (6) on the outside which each extend into a spacer (4).

Abstract: An engine compartment casing element (1), in particular for sound absorption, with a foamed material element (2) attached to a wall element (3) which is preferably reverberant, the foamed material element (2) having a skin-like covering (5) on the side facing away from the wall element (3). The foamed material element (2) is perforated, the foamed material element (2) is also covered on both sides with an air-impermeable plastic sheeting (5) or (6) respectively which also covers the perforated areas (holes 4), and the foamed material element (2) is installed so that it runs at least in part at a distance (a) from the wall element (3).